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Stock-Based Compensation Plan (Restricted Stock Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan, authorized common stock	300,000
Shares, Nonvested, beginning of period	13,700	12,772
Shares, Granted	14,500	12,300
Shares, Vested	(7,363)	(5,691)
Shares, Forfeited	(737)	(2,081)
Shares, Nonvested, end of period	20,100	17,300
Weighted Average Grant Date Fair Value, Nonvested, beginning of period	$ 16.11	$ 16.89
Weighted Average Grant Date Fair Value, Granted	$ 17.87	$ 16.76
Weighted Average Grant Date Fair Value, Vested	$ 16.10	$ 17.26
Weighted Average Grant Date Fair Value, Forfeited	$ 16.25	$ 18.38
Weighted Average Grant Date Fair Value, Nonvested, end of period	$ 17.37	$ 16.50
Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service period of grants to executive officers	9 months
Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service period of grants to executive officers	3 years

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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